Groyne

A groyne (groin in the US) is a method of coastal defense against erosion. Groynes are structures running perpendicular to the shoreline, across a beach into the sea or a river.

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  Groyne at Mundesley, Norfolk, UK
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  2 sticks of a groyne
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  groynes
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  A groyne at Crescent Beach in Surrey, British Columbia
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  Rocky groyne in Capbreton, France